Fixed: Corrupt image files when downloading from redirecting Url

(cherry picked from commit e28b2e83284f689d3620d8d394ef35fdfd55646f)
Closes #108
This commit is contained in:
Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f